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Leases (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Dec. 31, 2021	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Oct. 08, 2020	Dec. 31, 2019 USD ($)
Leases [Line Items]
Operating lease liabilities			$ 59,650		$ 68,727
Number of renewal options | item			2
Extension term			5 years
Increase in liability		$ 32,079	$ 1,326
Minimum [Member]
Leases [Line Items]
Lease term			2 years 6 months
Maximum [Member]
Leases [Line Items]
Lease term			8 years
Office Space [Member]
Leases [Line Items]
Operating lease liabilities			$ 3,000
Lease term			11 years 6 months
Scenario, Forecast [Member]
Leases [Line Items]
Change in leased area	40.00%
Subsequent Event [Member]
Leases [Line Items]
Extension term				1 month

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- Definition

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Leases [Line Items]

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- Definition

Lesee operating lease, Number of renewal options

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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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